Add 18/24 and 72/21
1st number: 18/24, 2nd number: 3 9/21
18/24 + 72/21 is 117/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 24 and 21 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 24 × 7 = 168,
18/24 = 18 × 7/24 × 7 = 126/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
72/21 = 72 × 8/21 × 8 = 576/168 - Add the two like fractions:
126/168 + 576/168 = 126 + 576/168 = 702/168 - 702/168 simplified gives 117/28
- So, 18/24 + 72/21 = 117/28
In mixed form: 45/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/24+72/21 18/48+72/21 18/24+72/42 54/24+72/21 18/72+72/21 18/24+72/63 90/24+72/21